How to say in Czech: Their Vietnamese is very good.

English
is very good.
Czech
Jejich vietnamština je velmi dobrá.
I do not speak Vietnamese very well.
You speak Vietnamese very well.
How good is their Vietnamese?
Their Vietnamese is getting better.
Their native language is Vietnamese.
Are they learning Vietnamese on their own?
He is learning Vietnamese.
Is he learning Vietnamese?
Vietnamese is a difficult language.
Vietnamese is difficult.

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